feat(pagination): add updateItem for in-place list updates and optimize notifications

Add `updateItem` function to cursor pagination hook for updating single items
without full list refresh. Use this in NotificationsScreen to mark messages
as read locally instead of refetching. Also add `is_blocked` detection in
postService and userProfile to show blocked state in profile screen.

src/screens/profile/UserProfileScreen.tsx

@@ -47,6 +47,7 @@ export const UserProfileScreen: React.FC<UserProfileScreenProps> = ({ mode, user
     handleMessage,
     handleBlock,
     isBlocked,
+    isBlockedProfile,
     handleSettings,
     handleEditProfile,
     isCurrentUser,
@@ -54,7 +55,18 @@ export const UserProfileScreen: React.FC<UserProfileScreenProps> = ({ mode, user
   } = useUserProfile({ mode, userId, isDesktop, isTablet });
 
   // 渲染帖子列表 - Twitter 风格无边框
-  const renderPostList = useCallback((postList: Post[], emptyTitle: string, emptyDesc: string) => {
+  const renderPostList = useCallback((postList: Post[], emptyTitle: string, emptyDesc: string, blockedTitle?: string, blockedDesc?: string) => {
+    if (isBlockedProfile && blockedTitle) {
+      return (
+        <EmptyState
+          title={blockedTitle}
+          description={blockedDesc || ''}
+          icon="account-off-outline"
+          variant="modern"
+        />
+      );
+    }
+
     if (postList.length === 0) {
       return (
         <EmptyState
@@ -85,7 +97,7 @@ export const UserProfileScreen: React.FC<UserProfileScreenProps> = ({ mode, user
         })}
       </View>
     );
-  }, [currentUser?.id, handlePostAction, activeTab]);
+  }, [currentUser?.id, handlePostAction, activeTab, isBlockedProfile]);
 
   // 渲染内容
   const renderContent = useCallback(() => {
@@ -95,7 +107,9 @@ export const UserProfileScreen: React.FC<UserProfileScreenProps> = ({ mode, user
       return renderPostList(
         posts,
         mode === 'self' ? '还没有帖子' : '这个用户还没有发布任何帖子',
-        mode === 'self' ? '分享你的想法，发布第一条帖子吧' : ''
+        mode === 'self' ? '分享你的想法，发布第一条帖子吧' : '',
+        mode === 'other' ? '已将该用户拉黑' : undefined,
+        mode === 'other' ? '你已将此用户拉黑，不再显示其帖子' : undefined
       );
     }